CN109751428B

CN109751428B - Electronic expansion valve

Info

Publication number: CN109751428B
Application number: CN201711084481.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2017-11-07
Filing date: 2017-11-07
Publication date: 2022-04-26
Anticipated expiration: 2037-11-07
Also published as: CN109751428A

Abstract

The electronic expansion valve provided by the invention comprises a valve seat and a nut, wherein the nut is fixedly matched with the valve seat in the axial direction, the valve seat is provided with a first guide hole part, a sleeve of a valve needle component of a screw rod can freely move in the first guide hole, and the first guide hole part provides a guide effect for the sleeve.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve for adjusting the flow of refrigerant fluid.

Background

In the technical field of refrigeration and heating, an electronic expansion valve is a refrigerant flow control component of refrigeration and heating equipment, and the working process generally comprises the following steps: the screw rod is fixedly connected with the magnetic rotor and rotates along with the magnetic rotor to drive the valve needle to move, a nut component is arranged in the electronic expansion valve and is provided with an internal thread structure, correspondingly, the screw rod is provided with an external thread structure, the screw rod drives the valve needle to move up and down while rotating through the matching of a thread pair, and the flow of a refrigerant flowing through the valve port part is regulated in a mode of regulating the opening degree between the valve needle and the valve port part, so that the system function is realized and the aim of accurate control is fulfilled.

When the electronic expansion valve is used in a refrigeration system, certain impact can be brought to a valve needle or a screw rod by the vibration of a compressor and the pressure of refrigerant pulses; the coaxiality of all parts is influenced, and the screw rod or the valve needle deflects, so that the abrasion of a screw pair and the abrasion of a valve port part are caused, and the abrasion is accompanied with the generation of noise, so that the technical problem to be solved by technical personnel in the field is solved urgently by how to design a valve needle screw rod assembly of the electronic expansion valve to realize effective guiding and improve the coaxiality of all parts of the electronic expansion valve.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an electronic expansion valve, which can provide good guidance for a valve needle screw rod component, relatively ensure the coaxiality of the valve needle component, a nut and a valve port of the screw rod, and improve the actuation reliability of a poppet valve. Therefore, the electronic expansion valve provided by the invention adopts the following technical scheme:

the method comprises the following steps: a valve seat including a valve cavity and a valve port portion, the valve seat being formed with a first guide hole portion; the valve needle can open or close the valve port part so as to regulate the flow of the refrigerant flowing through the valve port part; the screw rod is in floating connection with the valve needle through a sleeve; the nut comprises a nut matching part, the nut is in threaded matching with the screw rod, the valve seat is in fixed matching with the nut, the sleeve can freely move in the first guide hole part, and the first guide hole part guides the sleeve.

The electronic expansion valve provided by the invention has the advantages that through the optimized design of the valve seat structure, the valve seat is provided with the first guide hole part, the sleeve can freely move in the first guide hole part, the first guide hole part can provide a guide effect for the sleeve, the coaxiality of the screw rod valve needle component, the nut and the valve port can be relatively ensured, and the actuation reliability of the electronic expansion valve relative to the poppet valve is relatively ensured.

Drawings

FIG. 1 is a schematic view of an electronic expansion valve according to a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a valve seat structure of an electronic expansion valve according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an electronic expansion valve according to a second embodiment of the present invention;

FIG. 4 is an enlarged view of a valve seat structure of an electronic expansion valve according to a second embodiment of the present invention;

FIG. 5 is a schematic view of a second embodiment of an electronic expansion valve according to the present invention, showing a structure of a valve seat and a nut;

FIG. 6 is a schematic view of another valve seat and nut combination structure of an electronic expansion valve according to a second embodiment of the present invention;

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a valve seat of an electronic expansion valve according to an embodiment of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, other embodiments that may be obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention, and it should be noted that the first, second, etc. ordinal terms mentioned herein are only definitions of different components and are not to be considered as sequential ordering of the components.

Referring to fig. 1 and 2, in the electronic expansion valve of the first embodiment, the electronic expansion valve has a valve seat 10, the valve seat 10 in this embodiment may be integrally formed by metal cutting, and a first connection pipe 110 is connected to a circumferential direction thereof, a second connection pipe 100 is connected to a lower end portion in an axial direction thereof, and a valve chamber 12 is formed inside the valve seat 10 for flowing a refrigerant. The valve seat 10 is provided with a valve port 11, the valve port 11 and the valve needle 30 cooperate to change a flow area between the valve port 11 and the valve needle 30, so as to achieve precise flow rate adjustment, and the valve seat 10, the first connecting pipe 110 and the second connecting pipe 100 together form a valve seat assembly. The first connection pipe 110, the valve port 11, and the second connection pipe 100 form a refrigerant flow channel. The refrigerant may flow in from the first connection pipe 110, flow through the valve port 11, and flow out from the second connection pipe 100, or may flow in from the second connection pipe 100, flow through the valve port 11, and flow out from the first connection pipe 110. The valve seat 10 further has a first guide hole portion 10a and a first protrusion portion 13, the first guide hole portion 10a is a through hole portion provided in the valve seat 10, the first protrusion portion 13 protrudes into the valve cavity 12 and forms a second guide hole portion 13a, and the needle 33 can extend into the valve cavity 12 through the second guide hole portion to open or close the valve port portion 11 to adjust the flow rate of the refrigerant flowing through the valve port portion 11. The valve needle 33 is freely movable in this second guide bore portion 13a, the inner diameter of the second guide bore portion 13a matching the outer diameter of the valve needle 33, the second guide bore portion 13a providing a guiding effect for the valve needle 33.

Above the valve seat 10, a cover 21 is provided, the cover 21 being substantially cup-shaped, having an opening at the bottom thereof and being fixedly connected to the valve seat 10. Specifically, the first step portion 10b, the second step portion 10c, the third step portion 10d, and the extension portion 14 may be provided at the upper end of the valve seat 10, the extension portion 14 may be extended upward from the third step portion 10d to form an extended step portion 14a, and the bottom opening of the cover 21 may be abutted against the second step portion 10c and fixed by welding in real time. A shell 22 is further disposed above the cover 21, the shell 22 is fixed to the valve seat 10 through the cover 21, and the shell 22 and the cover 21 can be fixed by welding, so that a relatively closed space is formed among the shell 22, the cover 21, and the valve seat 10, and the refrigerant flows and the flow rate is adjusted through the first connecting pipe 110 and the second connecting pipe 100. The housing 22 and the cover 21 together constitute the housing assembly 20.

In the space enclosed by the housing 22 and the cover 21, a magnetic rotor assembly 60 is disposed, the magnetic rotor assembly 60 includes a rotor part 61 and a connecting seat 62, the rotor part 61 can sense the signal of the stator coil part to rotate, and the lead screw 31 is fixedly connected with the rotor part 61 as a whole through the connecting seat 62.

The screw needle assembly 30 includes a screw 31, a sleeve 32 and a needle 33, the screw 31 and the needle 33 are connected in a floating manner by the sleeve 32, the sleeve 32 is generally cup-shaped and has an opening at the bottom, the needle 33 extends into the valve cavity 12 through the opening, the outer diameter of the sleeve 32 matches with the inner diameter of the first guide hole portion 10a, the sleeve 32 can freely move in the first guide hole portion 10a along the axial direction, the first guide hole portion 10a provides a guiding function for the sleeve 32, obviously, the valve seat 10 serves as a guiding component and is provided with the first guide hole portion 10a and the second guide hole portion 13a respectively providing a guiding function for the sleeve 32 and the needle 33, so as to achieve effective guiding for the needle screw assembly 30 and ensure coaxiality of the needle screw assembly 30 and the valve port 11. During operation of the electronic expansion valve, the valve needle 33 can move up and down within a certain stroke relative to the sleeve portion 32, but cannot be separated from the restriction of the sleeve portion 32.

The nut assembly 40 includes a nut 41, a connecting piece 42, the nut 41 has a nut matching portion 411, the nut matching portion 411 axially abuts against the upper end of the valve seat 10, the electronic expansion valve includes a containing cavity, the sleeve 32 is located in the containing cavity, and the screw thread matching action of the screw rod 31 and the nut 41 is passed through, the screw rod can drive the sleeve 32 to axially lift and lower in the containing cavity, the sleeve 32 can axially lift and lower along the inner wall of the nut matching portion 411 and the inner wall of the first guiding hole portion 10a, the nut matching portion 411 is a nut guiding portion, and the nut matching portion 411 and the first guiding hole portion 10a provide guiding action for the sleeve 32 at the same time. The nut fitting portion 411 is provided with a fitting protrusion 411a, the nut 41 is fixedly mounted on the cover 21 through the connecting piece 42, and the nut 41 may be formed by injection molding of a non-metal material and the connecting piece 42. The nut body 41 is provided with a through hole which is axially penetrated, an internal thread is arranged in the through hole, correspondingly, an external thread part is correspondingly arranged on the periphery of the screw rod 31, when the rotor part 61 is driven by an external coil, the rotor part 61 starts to rotate, the screw rod 31 is fixedly connected with the rotor part 61 into a whole through the connecting seat 62, so that the screw rod 31 also rotates along with the screw rod, the internal thread of the nut 41 and the external thread of the screw rod 31 are screwed to drive the screw rod 31 to axially move downwards so as to drive the valve needle 33 to do lifting motion, so that the valve needle 33 is close to or far away from the valve port part 11, and the purpose of adjusting the flow rate of the refrigerant passing through the valve port part 11 is achieved.

In the electronic expansion valve provided in the present embodiment, the valve seat 10 and the nut 41 are fixedly engaged, specifically, the engaging protrusion 411a provided by the nut engaging portion 411 and the extending step 14a of the extending portion 14 are in abutting engagement to fixedly engage the valve seat 10 and the nut 41, the valve seat 10 and the nut 41 further have a second fixed engagement embodiment, as shown in fig. 6, the lower end surface of the nut engaging portion 411 may be provided as a planar portion structure, the upper end portion of the extending portion 14 of the valve seat 10 may be provided as a planar portion, the two planar portions abut against each other to fixedly engage, as shown in fig. 3, a third fixed engagement embodiment of the valve seat 10 and the nut 41 may be provided, the nut engaging portion 411 may be provided with an engaging protrusion 411 'in a direction close to the sleeve 32, the extending step 14 a' may be provided on the extending portion 14, the valve seat 10 and the nut 41 can be fixedly connected to each other by abutting the engagement protrusion 411 'against the extended step portion 14 a'.

The structure of an electronic expansion valve according to a second embodiment of the present invention is specifically described with reference to fig. 3 to 6, in which the structure of the valve seat 10 is changed compared with the first embodiment, the valve seat 10 further includes a valve port seat 17, the valve port 11 is opened on the valve port seat 17, the valve port seat 17 includes a fitting portion 17a, the valve port seat 17 is integrally press-fitted into the valve seat 10, the valve seat 10 is further provided with a second protrusion 16 and a third protrusion 15, the second protrusion 16 and the third protrusion 15 protrude toward the valve cavity 12, the fitting portion 17a is abutted with the second protrusion 16 after the valve port seat 17 is integrally press-fitted into the valve seat 10, the valve seat 10 is further fixedly fitted with a valve needle guide 50, the valve seat 10 and the valve needle guide 50 are respectively formed and then fixedly connected, in this embodiment, the guide 50 is the second guide hole portion of the valve seat to guide the valve needle 33, the needle guide 50 has a needle guide hole 50a formed in the center thereof, the needle guide 50 has a guide stepped portion 51 formed at the upper end thereof, the needle guide 50 is press-fitted into the valve chamber 12 as a whole, and the guide stepped portion 51 is in abutting engagement with the third projecting portion 15. Wherein the inner diameter of the needle guide hole portion 50a matches the outer diameter of the needle 33, the needle 33 is freely movable in the axial direction within the needle guide hole 50a, the needle guide hole portion 50a provides a guide function for the needle 33, and the needle 33 extends into the valve chamber 12 through the needle guide hole portion 50a to open or close the valve port portion 11 to regulate the flow rate of the refrigerant flowing through the valve port portion 11. The valve seat 10 is formed with a first guiding hole portion 10a and a second guiding hole portion 13a, and the nut fitting portion 411 and the first guiding hole portion 10a simultaneously provide guidance for the sleeve 32, the valve needle guiding hole portion 50a of the valve needle guiding portion 50 provides guidance for the valve needle 33, the valve seat 10 and the nut 41 are abutted in the axial direction to be fitted and fixed, through the above optimized design of the structure of the electronic expansion valve, the coaxiality of the nut, the screw needle assembly and the valve port can be relatively ensured, the valve needle is guided by the valve needle guiding portion, the sleeve is simultaneously guided by the nut and the first guiding hole portion of the valve seat, thereby the fitting and guiding areas of the sleeve 32 and the valve needle 33 and each component can be increased to fully guide, the coaxiality between each component is further ensured, and the overall operation reliability of the electronic expansion valve is relatively accurately improved when the valve needle adjusts the flow rate of the refrigerant flowing through the valve port, the related matching manner is the same as the first embodiment and has been described in detail, and is not repeated herein.

The electronic expansion valve structure provided by the invention takes the valve seat as a guide part, the valve seat is provided with a first guide hole part and a second guide hole part, a nut matching part of a nut is abutted against the upper end part of the valve seat in the axial direction, a sleeve can perform axial lifting motion in an accommodating cavity of the electronic expansion valve along the inner wall of the nut matching part and the inner wall of the first guide hole part, the sleeve simultaneously provides a guide function by the nut matching part and the first guide hole part, and a valve needle provides a guide function by the second guide hole part, so that the deflection of the valve needle or a screw rod can be effectively prevented when the electronic expansion valve is actuated, central shafts of the nut component, the valve needle screw rod component and a valve port part are collinear, the coaxiality of all parts in operation is ensured, and the abrasion of the valve to the valve port is prevented so as to reduce the generation of noise.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An electronic expansion valve, comprising:

the valve seat (10) comprises a valve cavity (12) and a valve port part (11), wherein a first guide hole part (10 a) is formed in the valve seat (10), and a valve needle (33) can open or close the valve port part (11) by the valve needle (33) so as to regulate the flow of refrigerant flowing through the valve port part (11); the screw rod (31), the said screw rod (31) carries on the floating connection with said needle (33) through the bush (32); a nut (41), the nut (41) comprising a nut fitting portion (411), the nut (41) being in threaded engagement with the lead screw (31), the valve seat (10) being in fixed engagement with the nut (41), the sleeve (32) being freely movable within the first guide bore portion (10 a), the first guide bore portion (10 a) providing guidance to the sleeve (32);

the valve seat (10) further comprises a first step part (10 b), a second step part (10 c) and a third step part (10 d), the second step part (10 c) is fixedly connected with a cover shell 21, and a shell 22 is fixedly connected with the valve seat (10) through the cover shell 21;

the valve seat (10) further comprises an extending portion (14), the extending portion (14) axially extends upwards from the third step portion (10 d), and the extending portion (14) is fixedly matched with the nut matching portion (411).

2. An electronic expansion valve according to claim 1, wherein the valve seat (10) is further provided with a second guide bore portion (13 a), the valve needle (30) being freely movable within the second guide bore portion (13 a), the second guide bore portion (13 a) providing guidance for the valve needle (30).

3. An electronic expansion valve according to claim 1, wherein the upper end of the extension portion (14) is a flat surface portion, the lower end of the nut fitting portion (43) is a flat surface portion, and the upper end of the extension portion (14) is in fitting abutment with the lower end of the nut fitting portion (411).

4. An electronic expansion valve according to claim 1, wherein the extension portion (14) is formed with an extension step portion (14 a/14a '), the nut fitting portion (411) is formed with a fitting protrusion portion (411 a/411 a'), and the extension step portion (14 a/14a ') is in fitting abutment with the fitting protrusion portion (411 a/411 a').

5. An electronic expansion valve according to claim 1, further comprising a valve needle guide portion (50), wherein the valve needle guide portion (50) is press-fitted into the valve seat (10), wherein the valve needle guide portion (50) is formed with a valve needle guide hole portion (50 a), wherein the valve needle (33) is freely movable within the valve needle guide hole portion (50 a), and wherein the valve needle guide hole portion (50 a) provides guidance to the valve needle (33).

6. An electronic expansion valve according to claim 5, wherein the needle guide (50 a) comprises a guide step (51), the valve seat (10) is formed with a third protrusion (15), the needle guide (50 a) is press-fitted into the valve seat (10), and the guide step (51) abuts the third protrusion (15).

7. An electronic expansion valve according to any of claims 1-6, wherein the valve seat (10) is provided with a second protrusion (16), the valve seat (10) further comprises a valve port seat (17), the valve port portion (11) is formed in the valve port seat (17), the valve port seat (17) is provided with a mating portion (17 a), the valve port seat (17) is press-fitted into the valve seat (10), and the mating portion (17 a) abuts against the second protrusion (16).

8. An electronic expansion valve according to claim 1, wherein the nut (41) has a nut fitting portion (411), the nut fitting portion (411) abuts against an upper end portion of the valve seat (10) in an axial direction, the electronic expansion valve comprises a receiving chamber, the sleeve (32) is located in the receiving chamber and the sleeve (32) can perform an axial lifting movement along an inner wall of the nut fitting portion (411) and an inner wall of the first guide hole portion (10 a), and the sleeve (32) is simultaneously provided with a guiding function by the nut fitting portion (411) and the first guide hole portion (10 a).